Duplex Stainless Steels: Brief History and Some Recent Alloys

Alvarez‐Armas, I.

doi:10.2174/2212797610801010051

Cited by 152 publications

(71 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Dentre esses, 0,25 megatoneladas foram de aços inoxidáveis duplex [1]. Os aços inoxidáveis duplex podem ser definidos como aqueles que apresentam uma microestrutura mista de ferrita e austenita, na proporção de aproximadamente 50% para ambas fases [2]. Esses materiais foram desenvolvidos há mais de 70 anos [3] e tem seu uso comercial iniciado de forma extensiva na década de 70 [4].…”

Section: Introductionunclassified

Avaliação da soldagem multipasse de chapas espessas de aços inoxidáveis lean duplex UNS S32304 soldadas pelos processos SMAW, GMAW e FCAW: parte 1: propriedades mecânicas

et al. 2012

View full text Add to dashboard Cite

show abstract

Section: Introductionunclassified

Avaliação da soldagem multipasse de chapas espessas de aços inoxidáveis lean duplex UNS S32304 soldadas pelos processos SMAW, GMAW e FCAW: parte 1: propriedades mecânicas

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Since its introduction, super duplex stainless steel (SDSS) has been widely used as a material for aggressive corrosion environments, such as process piping of offshore topside structures and in chemical industries [1][2][3][4][5][6]. However, it has been reported that abnormally heat-treated SDSS exhibits severe deleterious corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dynamic Reheating Controlled by the Weaving Width on the Microstructure of GTA Bead-On-Pipe Weld Metal of 25% Cr Super Duplex Stainless Steel

Sung

Kang

2018

Metals

View full text Add to dashboard Cite

Gas tungsten arc welding (GTAW) with three different heat inputs controlled by the weaving width was performed to understand their effects on the microstructural changes during bead-on-pipe welding of super duplex stainless steel. The microstructure of the weld metals was categorized into three different types of zones: non-reheated, reheated type, and reheating-free zone. Even though single-pass welding with different weaving widths was employed, a reheated microstructure was detected, which has been previously observed with multiple pass welding. This phenomenon was called "dynamic reheating", because it was produced by the weaving operation during welding regardless of the weaving width. The categorized area fraction varied with the weaving width change. Electron backscatter diffraction (EBSD) results at the edge (the area near the fusion line) of the low-heat-input condition indicated a higher austenite volume fraction and a lower Cr 2 N fraction than that of the medium heat input condition. Thus, it described an inverse relationship, because higher heat input provided a lower austenite fraction. In addition, it was observed clearly that the austenite fraction at the medium heat input condition was dramatically increased by reheating, while the Cr 2 N fraction was reduced. Regardless of the weaving width, reheating contributed to the increase of the austenite fraction, further reducing the Cr 2 N quantity. The edge areas in the map showed an inverse relationship in the reheated area fraction between low heat input and medium heat input. For this reason, the austenite fraction on the weld metal was determined not only by the heat input, but also by the amount of reheating.

show abstract

“…The UNS S32205 standard DSS was developed to compete with austenitic grade AISI 304L in terms of corrosion resistance, but with better mechanical performance. Continuous modifications have been made to improve corrosion resistance, formability, and weldability, such as the addition of nitrogen to enhance pitting corrosion resistance and weldability 8,9 . It has been reported that this steel still accounts for over 70% of duplex grade deliveries 10 .…”

Section: Introductionmentioning

confidence: 99%

Friction stir welding of duplex and superduplex stainless steels and some aspects of microstructural characterization and mechanical performance

et al. 2016

View full text Add to dashboard Cite

Friction stir welding was used to produce butt joints on 6 mm thick plates of UNS S32101 lean duplex stainless steel, S32205 duplex stainless steel, and S32750 and S32760 superduplex stainless steels. Fully consolidated joints were achieved, with full penetration, using heat input of 1.37-1.50 kJ/mm. Specimens submitted to tensile testing performed perpendicular to the welding direction showed failure on the base metal, reflecting better mechanical performance of the welded joints. Furthermore, tensile testing along the joints revealed higher yield and tensile strengths in all cases, as well as increased elongation. Microstructural evaluation showed that there was pronounced grain refinement in the welded joints of all the materials studied, achieving grain sizes as small as 1 µm. The differences in the ferrite and austenite grain sizes in the stir zone, such as the degree of grain refinement, could be explained by the combination of dynamic recrystallization of austenite during the welding process and the recrystallization and growth of the ferrite grains, promoted firstly by the severe deformation and secondly by the high temperature inherent to the FSW process. Superduplex stainless steel FSW joints were more able to maintain a balanced microstructure, compared to conventional and lean duplex stainless steels, due to greater homogeneity of recrystallization in the welded joint.

show abstract

Duplex Stainless Steels: Brief History and Some Recent Alloys

Cited by 152 publications

References 0 publications

Avaliação da soldagem multipasse de chapas espessas de aços inoxidáveis lean duplex UNS S32304 soldadas pelos processos SMAW, GMAW e FCAW: parte 1: propriedades mecânicas

Avaliação da soldagem multipasse de chapas espessas de aços inoxidáveis lean duplex UNS S32304 soldadas pelos processos SMAW, GMAW e FCAW: parte 1: propriedades mecânicas

Effect of Dynamic Reheating Controlled by the Weaving Width on the Microstructure of GTA Bead-On-Pipe Weld Metal of 25% Cr Super Duplex Stainless Steel

Friction stir welding of duplex and superduplex stainless steels and some aspects of microstructural characterization and mechanical performance

Contact Info

Product

Resources

About